Journal
ANALYST
Volume 136, Issue 7, Pages 1339-1343Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0an00804d
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Funding
- Korean Government [2010-0018895, 2010-0001481, 2010-0001480]
- WCU [R31-2008-000-10010-0]
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In this paper, we report new rhodamine hydrazone derivatives bearing thiol and carboxylic acid groups as selective fluorescent and colorimetric chemosensors for Hg2+. The ring-opening process of spirolactam enables the large fluorescent enhancement and colorimetric change upon the addition of Hg2+. The sample containing Hg2+ was mixed with one of the chemosensors in a microchannel where the sensor was examined using confocal laser scanning microscopy. A plot of the fluorescent intensities of both chemosensors versus the log concentration of Hg2+ exhibited a linear response (r(2) = 95) in the range of 1 nM-1 mu M, and the detection limits were 1 nM and 4.2 nM, respectively. Both chemosensors also enable the visualization of Hg2+ accumulated in the nematode Caenorhabditis elegans previously exposed to nanomolar concentrations of Hg2+.
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